If eating dinner is anything like making music for Otis Jackson Jr., the man must never leave the goddamn table. The California producer/rapper best known as Madlib has the kind of overflowing discography that indicates a compulsive drive to create. In short and incomplete order, he's done solo releases as Madlib, Quasimoto, Beat Konducta, and Yesterdays New Quintet, plus collaborations with MF DOOM, J Dilla, Talib Kweli, Lootpack, and Ivan Conti, plus remixes for heavyweights like Jay-Z and Beastie Boys. The crate worshiper's freshest accomplishment is Yessir Whatever, a 12-years-in-the-making assembly of work as his high-pitched alter ego Quasimoto. On Friday, Madlib will be in S.F. for "Welcome to Zamrock," a DJ set in which he'll pluck and rewire material from Zambia's 1970s psych- and funk-infused rock scene. If the collector in you needs an extra nudge, he'll also sell his limited-run Rock Konducta 45 at this one-off show.